Inscriber.



No. 726,002. j PATENTED APR. 2 1910s.- R. H. SMITH.

INSCRIBEB; I APPLIOATION FILED JULY 9, 1902. 4 no uomm. 2 SHEETS-SHEET1.

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NITED ST T PATENT OFFICE.

ROY H. SMITH, OF RIALTO, CALIFORNIA, ASSIGNOR OF ONE-HALF TO GUY S.DYER, OF ALVARADO, OALIFORNIAQ INSCRIBER.

SPECIFICATION forming part of Letters Patent No. 726,002, dated April21, 1903.

Application filed J lio, 1902. Serial no. ilissz. ot moaen T0 aZZwhom/jimmy concem q I Be it known that I,' ROY I-I. SMITH, a'citi'zen ofthe United States, residing at Rialto, in'the county ofSa'n Bernardinoand State of Oal'is fornia, have invented certain new and useful 5Improvements in Inscrib'ers, of which the following is a specification.i

This invention relates to instruments for drawing or marking regularcurved lines, and has for its object the provision of apparatus adaptedto be used for drawing or inscribing a circle or an ellipse upon a planesurface and which may also be employed to inscribe a line upon anycurved or irregular surface, such as would be made by-jthe intersectionat any angle of a cylinder or a cone with said surface. Furtherobjects.v are to provide means for adjusting andholding the instrumentin the precise pOsitionFdesired and for setting the marking-point in'itsproper position in relation to the strument-.-

Minorobjects will become apparent'from the description. J To these endsmy invention consists in the novel features and combinations-hereinafter described'and claimed, an embodiment there pivotal point oftheinof being illustrated in the accompanyingdraw ings, in which FigureI is a sideview of the inscriber adjusted to draw an elliptical curveupon a plane surface. Fig. II is a side elevation of the instrument setfor drawing such a line upon an irregular surface as would be made bythe intersection of a cone with said surface. Fig. III is a plan view,and Fig. IV is a side elevation, of the jointed arms of the device. endof the pivotal rod a.

The reference-letter a indicates a pivotal rod having a circularcross-section of unvarying diameter and provided atits lower end with asuitable point. A sleeve b is-fitted closely to saidrod, but'adapted toslide readily thereon. .A'similar sleeve'ccarriesa scribing-rod d, whichis also accurately sized to a close sliding fit in its'sleeve. The saidsleeves are provided with clamping-screws, as shown at e and f, by meansof which they may be fastened rigidly to their respective rods.Projecting laterally from the respective sleeves Fig. V is a side viewof the upper.

b and c are brackets g and h, having. their extremities offset;flattened, and'rounded, so {as :to fit'togetherv and form, togetheryvitha mla'mping-screw 'i, a hinge-joint, as -plainly shown in Figs. III andIV. The outer faces of the hinge-limbs of said brackets may be graduatedaround the outer portions of their peripheries for the purpose ofindicating the angle of the rods a and d in relation to each other,according as said graduated lines register, respectively,with marks,such asj, Fig. IV, upon the other hinge members. When it is desired tospread the rods (1 and (1 farther apart, a distance-piece or link It,together with an additional: clamping-screw, such as i, may be employed,as shown in Fig. II. The ends of these distance-pieces should be madesimilar in all respects;save the graduations, to the hinge-limbs of thebrackets g and h and should be provided. with registering markssimilar-to that shown at j.

For the purpose of setting and supporting the pivotal: rod atv at anyangle which may be desired I employ a circularbracefor'protractor-arm Z,clamped at'its lowert end toa suitable base plate m by a thumb-screwp'pr other "suitable'me'ans; The periphery of the protractor should begraduated, as shown, to in- 'dicate angles up to ninetydegrees at least,

so that the rod at can be set either vertically or inclined at anydesired angle.

In order to permit'of the rod a turning upon its point in certainoperations and also for adjusting its length when required, atelescoping or pin-and-socket joint is formed in its upper end, asplainly shown in Fig. V, the "socket being formed in the extension 0 ofthe rodyand a set-screw p being tapped therein, soasto clamp the reducedend q of the rod a in the said socket. A slot: is m'adein the extension0 to receive the protractorLIand a screw r is provided to clamp therodiito the protractor. An opening s. .may'be u'iade in one side of therod through .which'the'graduated'lines upon the protractor may be seen.

. in operatingthe -devicerto drawa circle dinary compass. To draw anellipse upon a plane surface, the pivotal rod is inclined to therequisite angle, as in Fig. I, and may be held in position by beingclamped to the protractor. The points being set the proper distanceapart, the screw 1 is then tightened. The screw f may be tightened andthe screw e loosened, so that the sleeve 1) is free to slide upon therod a, or, if preferred, the screw 6 may be tightened and the screws fand p loosened, in which case the rod (1 will be rotated with thesleeves, and the rod d will slide through the sleeve 0.

In operating upon a curved or irregular surface, as in Fig. II, the roda will represent the position of the axis of either a cylinder or a conewhich'intersects said surface, and the axis of the rod d will lie in thesurface of such cylinder or cone. If the screw e is loosened and thescrew ftightened, the instrument will describe a line representing theintersection of a cylinder with the surface upon which the line is drawnwhatever the angle may be between either rod and the said surface; butby tightening the screw 6, loosening the screw f, and also loosening thescrew 19, if the protractor is employed, and setting the rod (1 at anangle to the rod (1, the scribing-point will follow the surface operatedupon, so as to outline the intersection of a cone with said surface. Theangle between the slant height and the axis of the cone required isfound upon the graduated joint and set to register with the mark j. Theapproximate angle between the surface operated upon aud the axis of acone or cylinder, as the case may be, is found upon the protractor Z.

Various well-known scribing and center points may be employed and othermodifications may be made in the details of the device provided theprinciples of construction set forth respectively in the followingclaims are employed.

I therefore particularly point out and claim as my invention 1. Thecombination of a pivotal rod having a suitable point at its lower end, ascribingrod provided with a point adapted for marking a line, sleevesadapted to slide and rotate one upon each of the said rods respectivelyand each provided with means for clamping them thereon, alaterally-projecting arm upon each sleeve, said arms being hingedtogether so as to be movable in a plane coincident with or parallel tothe axes of the said rods, and means for clamping the said hinge-joint,substantially as set forth.

2. The combination of a pivotal rod having a suitable point at its lowerend, a scribingrod provided with a point adapted for marking a line,sleeves adapted to slide and rotate one upon each of the said rodsrespectively and each provided with means for clamping them thereon, alaterally-projecting arm upon each sleeve, said arms having their endsflattened, rounded and hinged together so as to be movable in a planecoincident with or parallel to the axes of the said rods, means forclamping the said hinge-joint, and graduated lines upon said hinge-jointadapted to indicate the angular inclination of the said rods relativelyto each other, substantially as set forth.

3. The combination of a pivotal rod having a suitable point at its lowerend, a scribingrod provided with a point adapted for marking a line,sleeves adapted to slide and rotateone upon each of the said rodsrespectively and each provided with means for clamping them thereon, aconnecting-link between said sleeves, a laterally-projecting arm uponeach sleeve, said arms having their ends flattened, rounded and hingedrespectively to opposite ends of said link so as to be movable in aplane coincident with or parallel to the axes of the said rods, meansfor clamping the said hinge-joints, and graduated lines upon saidhingejoints adapted to indicate the angular inclination of the said rodsrelatively to each other, substantially as set forth.

4. The combination of a pivotal rod having a suitable point at its lowerend, a scribingrod provided with a point adapted for marking a line,sleeves adapted to slide and rotate one upon each of the said rodsrespectively and each provided with means for clamping them thereon, alaterally-projecting arm upon each sleeve, said arms being hingedtogether by a suitable clamping-screw, so as to be movable in a planecoincident with or parallel to the axes of the said rods, an arc-shapedroo brace supported bya base-plate, and suitable means for clamping theupper end of said' pivotal rod to said brace, substantially as and forthe purpose set forth.

5. The combination of a pivotal rod having a suitable point at its lowerend, a scribingrod provided with a point adapted for marking a line,sleeves adapted to slide and rotate one upon each of the said rodsrespectively and each provided with means for clamping no them thereon,alaterally-projecting arm upon each sleeve, said arms being hingedtogether by a clamping-screw, so as to be movable in a plane coincidentwith or parallel to the axes of the said rods, an arc shaped bracesupr15 ported by a suitable base-plate and having graduated linesthereon to indicate angles, and an extension of said pivotal rod adaptedto be clamped upon said brace and provided with a socket to receive theupper end of said pivotal rod and means for clamping it thereto,substantially as set forth.

In testimony whereof I affix my signature, in the presence of twosubscribing witnesses, at Benton Harbor, Michigan, July 5, 1902.

ROY II. SMITII.

Witnesses:

I. A. NICHOL, IVA NIEOE.

